perf(schedule): 减少重渲染与冗余动画

- useCanvasNodeDrag.moveDrag 改 ref 直改 DOM,松手才写 store,避免拖拽期间反复重渲染 SchedulePage
- runs 轮询改 setTimeout 链式 + 移除 runs 依赖,避免每 1.5s 重建 interval
- SchedulePage 拆 PositionDraftBadge / RunNowButton,删除冗余的 runs/runsLoading/positionDraftCount 订阅
- 拆 ScheduleEdge 组件 + React.memo + useMemo,切换 edge 选中时不再重算所有 edgePath
- 删除 schedule.css 中引用未定义 keyframes 的 modal-in/spin 死动画
- 删除 .schedule-edge-line transition、.schedule-run-result-backdrop backdrop-filter;补 .artifact-card transition

Refs: kaneo #19-#24

frontend/app/styles/schedule.css

@@ -294,6 +294,10 @@
   background: #fff;
   cursor: grab;
   user-select: none;
+  transition:
+    transform .15s ease,
+    box-shadow .15s ease,
+    border-color .15s ease;
 }
 
 .artifact-card:hover {
@@ -431,7 +435,6 @@
   fill: none;
   stroke: #4e92db;
   stroke-width: 2.2;
-  transition: stroke .15s, stroke-width .15s;
 }
 
 .schedule-edge-hit {
@@ -1083,7 +1086,6 @@
   border: 0;
   background: rgb(10 27 45 / 46%);
   cursor: default;
-  backdrop-filter: blur(2px);
 }
 
 .schedule-run-result-modal {
@@ -1101,7 +1103,6 @@
   box-shadow: 0 24px 80px rgb(8 27 48 / 30%);
   grid-template-rows: auto minmax(0, 1fr);
   transform: translate(-50%, -50%);
-  animation: modal-in .18s ease-out;
 }
 
 .schedule-run-result-modal__header {
@@ -1501,7 +1502,6 @@
   border: 2px solid #b9d4ef;
   border-top-color: #1978d4;
   border-radius: 50%;
-  animation: spin .7s linear infinite;
 }
 
 @media (max-width: 1500px) {